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G. G. PERKINS.

INGANDE-SG ENT ELEGTRIG LAMP.

No. 274,654; Patented Mar.27,1888.

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ATTEST: Y INVENTUF}: @amazifw UNITED STATES PATENT OFFIQE.

CHARLES G. PERKINS, OF CAMDEN, NEW, JERSEY.

INCANDESCENT ELECTRIC LAMP.

SPECIFICATION forming part of Letters Patent No. 2'74,654, dated March 27, 1883.

Application filed August 5, 1882. (No inodel.)

To all whom it may concern:

Be it known that 1, CHARLES G. PERKINS, of the city of Camden, in the county of Caniden and State of New Jersey, have invented certain new and useful Improvements in Incandescent Lamps,rof which the following is a full, clear, concise, and exact description,

such as will enable others skilled in the art to which my invention relates to make and use the same, reference being bad to the accompa- -nyingdrawings.

The ordinary incandescent lamps now in use are very uncertain in the length of time they last, at best being of short duratiomand when more than one filament has been incloscd in a single chamber the mechanism is so complicated as to render the lamp of but little commercial value. 1 1

The object of this invention is to construct a lamp which shall have two or'more filaments inclosed in one chamber for the purpose ofprolongingthe use of such lamp, and to simplify the mechanism for operating these filaments, so that the lamp shall have a more extended application, and thus be of greater commercial value than lamps hitherto constructed upon similar principles.

Figure 1 represents a full-size view of my improved lamp, with the base thereof shown in section, so as to expose the switch mechanism, and the manner in which the filaments are put in circuit therewith. Fig. 2 is a view of the switch-box, partly in section, in which maybe seen the thumb-piece, with the switch attachment, and the sockets in which the wires leading to the carbon filaments are placed for putting these filaments in circuit. Fig. 3 represents two separate views of the contact making and breaking spring, showing this spring divided at one end into as many strips as there arefilaments in the globe. Fig.4 shows a construction of carbon filament suitable for this lamp, the whole forming one piece, which is clamped in the center at the top of the lamp. Fig. 5 represents a view of the top of the switchbox, showing the position of the contact-sockets into which. the wires leading from the car- 7 ing separately secured at the base of thelamp, as shown atbb.- The platinum wires to which a a are secured are sealed at 0 and c, and extend outside the lamp sufficiently far to pass intothe socketsd d,.where they fit tightly, and where contact with the switch mechanism is made.

c is the contact maker and breaker, which is divided at one end into as many strips as there are carbon filaments to be put in or out of e at the slot 6 when the spring eis required to be carried round. Should the thumb-piece be turned in the wrong direction, it slides over 6, leaving the latter stationary. This is also fully shown in Fig. 2.

When the lamp is placed in circuit one pole is connected to the central wire at h, the other pole being connected to any suitable part of the fixture upon which the lamp is set up, this fixture having metallic connection with the thumb'piece and contact-spring e.

g is a spring interposed between the thumbpiece and the switch-box. Its object is to prevent the thumb-piece from working loose. If, now, g be turned until the shoulder of the graduated notch upon its end meets the elevated portion of the slot 0 of e, the latter may be carried round until it snaps over the pin 6, when No. 1 on c, Fig. 3, will put one of the carbon filaments in circuit. If g be turned\ still farther, No. 2 makes contact, as in No. 1, putting the opposite filament in circuit, and so on with the other carbons in the globe.- It will thus be seen that either one light at the in the globe, may be put in circuit by the sim ple mechanism above described.

Having thus described my invention, what Iclaim as new, and desire to secure by Letters Patent, is-

1. In an incandescent electric lamp, the combinationofanumberof carbon filamentsformed of one, piece, mounted upon a central supporting and conducting wire, as at b, the other ends 10 as to simultaneously or singly operate a number of lights in one chamber, said contactspring having the slot 0 and the depression at one side thereof, and the thumb-piece g,havin g the graduated notch gflwith the spring 9, the

whole constructed substantially as described, I 5

and for the purpose set forth.

I CHARLES G. PERKINS. Witnesses:

DAVID LAW, HERBERT J. LAW. 

